Double in-situ synthesis of polyacrylate/nano-TiO2 composite latex

• Polyacylate/nano-TiO2 composite latex was prepared via double in situ polymerization.
• Nano-TiO2 existed in polyacrylate latex and lied on the surface of latex particles.
• Nano-TiO2 improved thermal, anti-yellowing and antibacterial properties of matrix.

Polyacrylate/nano-TiO2 composite latex was prepared via double in-situ polymerization using acrylamide (AM), vinyl acetate (VAc), butyl acrylate (BA) and methyl methacrylate (MMA) as monomers, tetrabutyl titanate (Ti(OBu)4) as precursor of TiO2. The morphology, structure and distribution of composite latex were characterized by Transmission Electron Microscope (TEM), Fourier Transform Infrared Spectroscopy (FTIR), Dynamic Light Scattering (DLS) and X-Ray Diffraction (XRD). The thermal stability, anti-yellowing and antibacterial properties of composite latex were also investigated. The results showed that nano-TiO2 consisted in polyacrylate latex and it was located on the surface of latex particles. The average particle size of polyacrylate/nano-TiO2 composite latex was 156.6 nm, which was bigger than that of pure polyacrylate (125.1 nm). The introduction of nano-TiO2 improved the thermal stability, anti-yellowing and antibacterial properties of the latex film. At last, the polyacrylate/nano-TiO2 composite latex was applied in leather finishing. Compared with polyacrylate latex, the properties of the leather finished by polyacrylate/nano-TiO2 composite latex were enhanced: water vapor permeability increased by 58% and water uptake decreased by 3.52%.

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